Is this favouritism?

I have an older brother and my mom does almost everything for him. Makes his lunch, washes his clothes, changes his sheets, cleans his room, always buys the food he likes. wants puts his clothes away, etc and celebrates anytime he does anything, even as simple as washing dishes or he passed a test recently and we went out for dinner to celebrate. In my case, I have been expected to make my on lunch, clean my room, change my sheets and all the rest of it since I was about 10-13, she doesn't remember what foods i do or don't like even though it's pretty much unchanged for years and even forgets my food intolerances. I've often struggled with going to school and recently my attendance had gone up to 85% and all I got from her was it could still be better, when I got a 90% on my test, I got a good job and that was it.

Sometimes I don't know if it's favouritsm or if maybe I'm just thinking about it too much.